I would look for a Summit 600, 99-02. Reliable motor with sleeves. ZX was a good chassis for its day. Once you get into 700's and 800's, things break more often.
I had mine done, Lasik. That was 17 years ago, I was 27 years old. Good results, typical side effects, halos, poor night vision, that all went away with time. My vision is degenerating now at the age of 43, I don't need glasses yet but distance and the need for readers will come. Best investment...
X's are aluminum bodied shocks vs SP steel body. I would prefer the steel body shocks due to less maintenance. For the price of the 2015 SP, it is a pretty easy decision.